WO2020182678A1

WO2020182678A1 - Method for influencing light beams in the interior of a motor vehicle, and motor vehicle for carrying out the method and mirror bank for such a motor vehicle

Info

Publication number: WO2020182678A1
Application number: PCT/EP2020/056079
Authority: WO
Inventors: Stefan Franke; Claudia KREFTER-DE BEER; Klaus Zander
Original assignee: Volkswagen Aktiengesellschaft
Priority date: 2019-03-14
Filing date: 2020-03-06
Publication date: 2020-09-17
Also published as: CN113518724A; EP3938229A1; US20210405364A1; KR102558435B1; KR20210135306A; JP2022523949A; DE102019203500A1; JP7257542B2

Abstract

The invention relates to a method for influencing light beams in the interior of a motor vehicle. The light beams come from the direction of a mirror bank (300, 300', 300'') associated with a head-up display (200). The invention proposes several solution approaches for providing an enhanced display option and simultaneously reducing a dazzling of a vehicle occupant by unwanted reflections. The light beams are generated in the mirror bank, wherein: - some of the generated light beams are blocked in the region of the mirror bank in such a way that a particular keep-clear region is created into which reflected light beams can no longer enter, or - generated light beams in the region of the mirror bank are directed without reflection onto a particular viewing region, or - the generated light beams in the region of the mirror bank are polarised and only such polarised portions of the light beams that cause no or only negligible reflections exit the mirror bank.

Description

description

Method for influencing light beams in the interior of a motor vehicle and motor vehicle for carrying out the method and mirror bench for such

Motor vehicle

The invention relates to a method for influencing light beams in the interior of a motor vehicle with the features of the preamble of claim 1. The invention also relates to a motor vehicle for carrying out the method and a mirror bench for such a motor vehicle.

Process with the features of the preamble of the claim are from

DE 10 2014 019 160 A1, DE 10 2014 019 039 A1 and DE 10 2010 032 998 A1 have become known.

For example, DE 10 2014 019 160 A1 shows a method for reducing a reflection when operating a head-up display of a motor vehicle. Specifically, the head-up display has a cover element and a masking element for masking out a deflected one

Light beam of an ambient light on. A control device determines a beam path of the deflected light beam, detects a current position and an orientation of the shielding element and determines an area around an eye point of a vehicle occupant that is to be kept free of the deflected light beam. If the deflected light beam passes through the area to be kept clear, the control device generates a control signal for setting a position of the shielding element in which the deflected light beam is shielded.

DE 10 2014 019 039 A1 describes a head-up display for a motor vehicle with a transparent cover pane and a projection unit for projecting an image onto a projection surface. The projection surface is located on the front window of the motor vehicle. The cover disk is designed to provide an external contact with the

Display device falling extraneous light (for example sunlight) from the

Deflect projection unit. In addition, the cover plate is designed in such a way that light falling on it from outside is deflected onto an absorption surface of an absorption plate. A solar cell arrangement is present at the absorption surface.

Finally, DE 10 2010 032 998 A1 reveals a head-up display for a motor vehicle, via which an image to be displayed is also shown on a windshield is projectable. A projection device of the head-up display has a semitransparent cover which is directed towards the windshield and which is designed to reflect extraneous light striking the cover from outside on an absorber surface. The absorber surface is formed by a coating on the inside of the front pane.

The present invention is based on the object of providing a method for influencing light rays in the interior of a motor vehicle, with which, on the one hand, expanded display options for a vehicle occupant can be implemented, but with which, however, at the same time, glare due to reflections of light beams in spite of the expanded display options in Limits can be kept.

The invention is also based on the object of providing a motor vehicle for carrying out the method. Finally, the invention is also intended to be a suitable one

Mirror bench are made available for installation in such a motor vehicle.

The present objects are achieved by a method with the features of patent claim 1, a motor vehicle with the features of claim 6 and a mirror bank with the features of patent claim 8. Advantageous designs or further developments of the invention can be found in the respective dependent claims.

In connection with a head-up display, a mirror bench is used in particular to protect a vehicle occupant from undesired reflections. Such reflections can arise, for example, from solar radiation that is reflected on the cover of the head-up display and / or on the front window and into one eye of the

Vehicle occupants fall. The cover of the head-up display is curved so that the light rays falling from the outside onto the cover always fall on the mirror bench. The inside of the mirror bench is mostly black-matt in order to absorb incident light. The mirror bench therefore serves as a light trap for incident light.

The invention is initially based on a method for influencing light beams in the interior of a motor vehicle. The light beams come from the direction of a mirror bank assigned to a head-up display into the interior.

According to the invention, the method is now designed in such a way that the light beams are generated in the mirror bank, • whereby some of the light rays generated are blocked in the area of the mirror bench. This is done in such a way that a certain free area is created, into which light rays generated in the mirror bench and reflected on a front pane and / or on a cover of the head-up display can no longer enter or

• whereby the generated light beams are aligned in the area of the mirror bench.

The alignment takes place in such a way that the light beams can only enter a certain viewing area without being reflected on a front pane and / or on a cover of the head-up display

• whereby the generated light beams are polarized in the area of the mirror bench. The polarization of the light beams is carried out in such a way that only those polarized portions of the light beams emerge from the mirror bank which are at a

Reflective surface, such as the windshield of a motor vehicle and / or on a transparent cover of the head-up display, are not or hardly reflected, but rather let through.

The above-mentioned alternative methods of dazzling a vehicle occupant, in particular the front vehicle occupants, which are caused by reflections of light beams on the windshield and / or on the cover of a head-up display, can be significantly reduced.

The above-mentioned free area is preferably formed as a radius around an eye point of a front passenger. Such a free area can for example be about 20 centimeters. The above-mentioned viewing area can be formed analogously.

In a further development of the method, it is proposed that the light beams be aligned in the area of the mirror bench in such a way that, viewed in a vertical plane, a light cone with a range of approximately 10 degrees to approximately 18 degrees, preferably of approximately 12 degrees to approximately 16 degrees, is created. Particularly preferably, a light cone of approximately 14 degrees is formed.

Such a design can ensure that a vehicle occupant is not or barely dazzled.

It is expedient here if the light cone formed has a luminance distribution in which a luminance on the axis of a main emission direction is at a maximum and in which the luminance drops continuously on both sides of the main emission direction. In particular, it is proposed that the luminance in a range of approximately 6 degrees to 8 degrees, preferably in a range of approximately 7 degrees on both sides of the main emission direction, is only in a range of a ninth to an eleventh, preferably in a range of a tenth from the maximum of the luminance.

As a result of a particularly large decrease in luminance generated in this way, it is possible to prevent reflections that occur through reflections that extend outside the main emission direction

Significantly reduce light rays. If these occur nevertheless, they remain barely visible due to the low luminance outside the main emission direction.

As mentioned at the beginning, the invention is also intended to provide a motor vehicle for carrying out the method according to the invention. Such a motor vehicle has a front window and at least one mirror bench which is arranged below the front window and which is assigned to a head-up display.

According to the invention, at least one display device extending in the longitudinal direction of the mirror bench is now arranged in the mirror bench. The display device preferably extends over the entire or almost the entire length of the mirror bench. The display device can emit light beams in the direction of an interior of the motor vehicle,

• wherein the mirror bench has on its front side facing in the interior a recess running approximately in the longitudinal direction of the mirror bench. A

The light exit surface of the display device is embedded in the recess in such a way that the light exit surface is at a distance from the front boundary lines of the recess facing a vehicle occupant (for example, the driver)

is set back or

• wherein the display device has a directional optics. With the directional optics, light beams emitted by the display device can be aligned in such a way that they are directed to a specific viewing area around an eye point of a front window without a reflection on a front pane and / or on a cover of the head-up display

Vehicle occupants can get or • the display device being provided with a polarization filter. In this way, the light beams generated by the display device in the area of the mirror bench can be polarized in such a way that only those polarized portions of the light beams emerge from the mirror bench in the direction of the interior that are on a reflective surface, such as on the front pane and / or on a translucent surface The head-up display is not or hardly reflected, but rather

be allowed through.

If, according to a further development in the motor vehicle, the mirror bench takes up at least a large part of a width of the windshield, the prerequisites are created for the vehicle occupants to be provided with a unique display device.

Finally, with the invention, a mirror bench is to be placed under protection, which can be installed in such a motor vehicle and with which the

method according to the invention can be carried out.

Such a mirror bench is by one in a longitudinal direction of the mirror bench

running display device marked,

• wherein a light exit surface of the display device in such a way in a recess

is embedded that the light exit surface is set back at a distance from the front boundary lines of the recess, which are therefore facing a vehicle occupant, such as the driver or front passenger

• wherein the display device has a directional optics with which of the

Display device emitted light rays are emitted in a certain cone of light or

• the display device being provided with a polarization filter.

The display device preferably extends over the entire or almost the entire length of the mirror bench.

According to a further embodiment of the concept of the invention, the recess is designed like a gap. On the one hand, this contributes to an original lighting effect when the Display device, on the other hand, this helps that unwanted light beams can be blocked more easily.

In an expedient development of the mirror bench, the recess is U-shaped in cross section. It has a first wall, a second wall and a base, the base being formed by a light exit surface of the display device.

On the basis of this configuration, a depression is thus formed, the cross section of which is clearly defined, that is to say has clearly defined corners or edges. This makes setting a desired beam path significantly easier.

Preferred exemplary embodiments of the invention are shown in the figures and are explained in more detail in the following description with reference to the figures. This also makes further advantages of the invention clear. The same reference symbols, even in different figures, relate to the same, comparable or functionally identical components. Corresponding or comparable properties and advantages are achieved, even if a repeated description or reference is not made. The figures are not, or at least not always, to scale. In some figures, proportions or distances can be exaggerated in order to be able to emphasize features of an exemplary embodiment more clearly.

It show each schematically

1 shows a part of a motor vehicle designed according to the invention in the area of a windshield, from above.

Figures 2 sectional views according to section II from FIG. 1, with an alternative

trained mirror banks,

3 shows a detailed representation according to detail III from FIGS. 2a and

FIG. 4 shows a possible luminance distribution of a light cone, as it is generated in FIG. 2b.

Reference is first made to FIGS. 1 and 2a. A motor vehicle K can be seen in the area of a front window 400. The motor vehicle K is equipped with a so-called head-up display (HUD) 200, which in the present exemplary embodiment extends over a large part of a width B of the motor vehicle K or the windshield 400.

The head-up display 200 is used to project information in the direction of or onto the windshield 400. For this purpose, the head-up display 200 has a projection device 204 which is accommodated in a housing 203 and which extends upward through a

translucent, preferably transparent cover 201 is covered. Furthermore, a cover panel 202 for covering the head-up display 200 is opposite a

Vehicle occupants present. The head-up display 200 is embedded in an instrument panel 100.

A mirror bench 300 is assigned to the head-up display 200 and is arranged in front of the head-up display 200 and is directly adjacent to the front pane 400.

The cover 201 is curved and, in addition to protecting the interior of the head-up display 200, serves to guide extraneous light (for example sunlight) falling on the cover 201 in the direction of the mirror bench 300. The mirror bench 300 absorbs the light almost completely, so it is designed as a mirror trap. The mirror bench 300 for its part extends with a longitudinal direction LR over the entire or almost the entire width B of the front pane 400.

Only one eye point 500 of a front vehicle occupant (e.g. vehicle driver) is shown. It can also be seen that in one facing the vehicle occupant

Front 301 of the mirror bench 300 a gap-like recess 303 is attached.

The gap-like depression 303 in turn extends in the longitudinal direction LR of the mirror bench 300 over its entire or almost entire length. The recess 303 is arranged or else in the area of a display device 305 embedded in the mirror bench 300

Part of the display device 305.

Information can be passed on to a vehicle occupant, for example in the form of animations, via a multiplicity of lighting means 302 arranged horizontally next to one another, which are preferably designed as light-emitting diodes. A device for the corresponding control of the lighting means 302 is not shown in more detail. The Control can take place as a function of certain driving and operating states of the motor vehicle K.

Light beams L1, L2 and L3 are shown by way of example, which are generated or can be generated by the display device 305 or by its lighting means 302. Starting from the display device 305, in particular from the gap-like depression 303, these pass in the direction of an interior I of the motor vehicle K.

The light beam L3 thus shows a light beam falling directly onto the eye point 500, which thus means a direct view of the display device 305 for the vehicle occupant. This is desirable.

The light beam L1 shows a light beam which is reflected once on the windshield 400 and then continues as a reflected light beam L1 'in the direction of the vehicle occupant.

The light beam L2 shows a light beam which is first reflected on the cover 201 in the direction of the windshield 400, then again on the windshield 400 and finally further in the direction of the vehicle occupant as a multiple mirrored image

or reflected light beam L2 'runs. It is not desirable for such single or multiple reflected light beams to reach the eye point of the vehicle occupant.

The gap-like depression 303 is therefore designed in such a way that such undesired beam paths do not enter a holding-free area 501 around the eye point 500 of the

Vehicle occupants and can dazzle them. The ray paths of the

Light beams L1 'and L2' represent the limit within which no other light beams get into the free area 501.

The present technical solution therefore does not serve in particular to completely avoid undesired single and multiple reflections. Rather, the solution is intended to limit only those reflections of light beams generated in the display device 305 which would fall into the free area 501 without the gap-like depression 303.

3, the area of the mirror bench 300 around the gap-like depression 303 is shown in more detail in cross section. The recess 303 extends from the

Front 301 horizontally in the direction of mirror bench 300. In particular, the cross section of the gap-like recess 303 is rectangular or U-shaped, with a upper wall 308, a lower wall 309 and with a base 310 of the recess 303.

The bottom 310 of the recess 303 is in the present solution by a

Light exit surface 311 of the only indicated display device 305 is formed. The

The light exit surface 311 is therefore set back at a distance a1 from the front side 301 or front boundary lines 312, 313 of the recess 303 and is thus embedded in the mirror bench 300. The height of the gap-like depression 303, that is to say a distance a2 between the walls 308 and 309, should be dimensioned so that the

Light exit surface 311 is still sufficiently visible to a vehicle occupant. The distance a2 can be several millimeters, for example. The distance a1 is to be set or optimized in such a way that the beam paths falling into the interior space I with the aforementioned single and multiple reflections cannot fall into the aforementioned free area 501.

Furthermore, the walls 308, 309 and also the base 310 of the recess 303 and also the mirror bench 300 itself are made of a dark, matt material or are coated accordingly in order to limit reflections to a minimum.

With reference to Fig. 2b, an alternative solution will now be described in which the

In contrast to the previous solution, motor vehicle K is equipped with a mirror bench 300 '. In contrast to the mirror bench 300, the mirror bench 300 ′ is not equipped with a gap, but the display device 305 is provided with directional optics 304 connected downstream of the lighting means 302.

By means of the directional optics 304, light beams L emerging from the display device 305 are aligned in the direction of a viewing area 502. In particular, the

preferably consisting of several lenses and / or collimators, multi-stage

Directional optics generates a cone of light 600 which on all sides of a main emission direction 601 has an emission angle a of preferably approximately 7 degrees in each case. Here is the

Main emission direction 601 aligned approximately with an eye point 500 of a vehicle occupant of average size. Said viewing area 502 is well imaged through the entire angular range of the light cone 600 of approximately 14 degrees.

As shown in FIG. 4, the light cone 600 has a large one

Luminance drop on. A luminance LD is plotted over the radiation angle a. The light cone 600 has a luminance distribution LDV, which in a Emission angle a of 0 degrees, that is to say has its maximum value in the main emission direction 601.

Already at a radiation angle a of 5 degrees deviating from the main radiation direction 601, the luminance LD falls significantly below the maximum value of the luminance LD and at a radiation angle a of about 7 degrees, deviating from the main radiation direction 601, drops to less than a tenth of the maximum luminance LD off. Because of this large decrease in luminance, reflections of light beams also occur outside the light cone 600, but these are barely perceptible to a vehicle occupant due to the extremely low luminance.

Finally, a further approach is to be described with reference to FIG. 2c.

In this approach, the motor vehicle K has a mirror bank 300 ″

The difference to the mirror bench 300 from the solution approach presented first is shown in FIG

Mirror bench 300 ″ does not have a gap-like depression, but is provided with a display device 305 which has a light exit surface 306 with a polarization filter 307.

It should be noted that both the display device 305 of the mirror bench 300 'and the display device 305 of the mirror bench 300 ″ have a light exit surface which, like the light exit surface 311 of the mirror bench 300, is designed like a line or strip and extends horizontally in the longitudinal direction LR of the mirror bench.

In the case of the mirror bench 300 ″, the light exit surface 306 is additionally covered with the polarization filter 307. The polarization filter 307 can, for example, be designed in the form of a film and glued onto the light exit surface 306.

The polarization filter 307 now results in that generated by the lighting means 302

Light rays are filtered in such a way that they only have a polarization component. The polarization filter 307 allows only that polarization component of the generated light rays to pass through which is not or hardly reflected at the reflection surfaces, but is allowed to pass through.

Thus, two light beams L4 and L5 filtered by the polarization filter 307 are shown by way of example in the figure. The light beams L4 and L5 are filtered so that they are at

Impinging on the front pane 400 (light beam L4) or when it impinging on the cover 201 (light beam L5) essentially without reflection by the reflective surface

step through. A remaining portion of the residual reflection of the light rays (compare L4 'and L5') is so small that it is no longer perceived as annoying when it hits an eye point 500 of a vehicle occupant.

List of reference symbols

100 instrument panel

200 head-up display (HUD)

201 cover

202 cover panel

203 housing

204 projection device

300, 300 ‘, 300“ mirror bench

301 front side

302 lamps

303 gap-like depression

304 directional optics

305 display device

306 light emission surface

307 polarizing filter

308 wall

309 wall

310 reason

311 light emission surface

312 boundary line

313 boundary line

400 windscreen

500 eye point

501 Clearance area

502 field of view

600 beams of light

601 main direction of emission

a1, a2 distances

B width

I interior

K motor vehicle

L rays of light

L1-L3 light beams

L1 ‘, L2‘ reflected light rays

L4, L5 filtered light rays L4 ', L5' reflected portion of the filtered light rays LD luminance

LDV luminance distribution

LR longitudinal direction

a beam angle

Claims

1. Method for influencing light rays (L, L1-L5) in the interior (I) of a

Motor vehicle (K), the light beams (L, L1-L5) coming into the interior (I) coming from the direction of a mirror bank (300, 300 ', 300 ”) assigned to a head-up display (200), characterized in that that the light rays (L, L1-L5) are generated in the mirror bank (300, 300 ', 300 "),

• whereby some of the light beams generated in the area of the mirror bench (300) are blocked in such a way that a certain free area (501) is created in which the mirror bench (300) is generated and is attached to a front pane (400) and / or a cover ( 201) of the head-up display (200) reflected light beams (L1, L2) can no longer reach or

• wherein the generated light beams (L) are aligned in the area of the mirror bench (300 ') in such a way that they are only reflected on a front pane (400) and / or on a cover (201) of the head-up display (200) can get into a certain viewing area (502) or

• whereby the light beams generated in the area of the mirror bench (300 ") are polarized in such a way that only those polarized portions (L4, L5) of the light beams that are at a front pane (400) and / or at a transparent cover (201) of the head-up display (200) are not reflected, but rather let through.

2. The method according to claim 1, characterized in that the light beams (L) in the area of the mirror bench (300 ‘) are aligned such that in a

Seen in the vertical plane, a light cone (600) is formed with a range from 10 ° to 18 °, preferably from 12 ° to 16 °, particularly preferably from 14 °.

3. The method according to claim 2, characterized in that the light cone (600) formed has a luminance distribution (LDV) in which a luminance (LD) on the axis of a main emission direction (601) is maximum and the luminance (LD) on both sides the main emission direction (601) decreases continuously.

4. The method according to claim 3, characterized in that the luminance (LD) in a range from 6 ° to 8 ° to the sides of the main emission direction (600) only in a range from a ninth to an eleventh of the maximum of the luminance (LD ) lies.

5. Motor vehicle (K) for performing the method according to one of the preceding claims, with a front window (400) and at least one below the

Front window (400) arranged mirror bank (300, 300 ', 300 "), which is assigned to a head-up display (200), characterized in that in the mirror bank (300, 300', 300") at least one in the longitudinal direction (LR) of the mirror bank (300, 300 ', 300 ″) extending display device (305) is arranged, of which

Light beams (L, L1-L5) can be emitted in the direction of an interior (I) of the motor vehicle (K),

• with the mirror bench (300) facing the interior (I)

The front side (301) has a recess (303) running in a longitudinal direction (LR) of the mirror bench (300) and a light exit surface (311) of the display device (305) is embedded in the recess (303) in such a way that the light exit surface (311) is opposite front boundary lines (312, 313) of the recess (303) is set back by a distance (a1) or

• wherein the display device (305) has directional optics (304) or

• wherein the display device (305) with a polarization filter (307)

is provided.

6. Motor vehicle (K) according to claim 5, characterized in that the mirror bench (300, 300 ‘, 300 ″) occupies at least a large part of a width (B) of the front window (400).

7. Mirror bench (300, 300 ‘, 300“) for a according to claim 5 or 6 formed

Motor vehicle (K), characterized by a display device (305) running in a longitudinal direction (LR) of the mirror bench (300, 300 ', 300 "), a light exit surface (311) of the display device (305) being embedded in a recess (303) is that the light exit surface (311) with respect to the front boundary lines (312, 313) of the recess (303) is set back by a distance (a1) or

• wherein the display device (305) has a directional optics (304) with which the display device (305) emits light beams (L) in one

certain light cones (600) can be emitted or

• wherein the display device (305) with a polarization filter (307)

is provided.

8. mirror bench (300) according to claim 7, characterized in that the recess (303) is formed like a gap.

9. mirror bench (300) according to claim 7 or 8, characterized in that the recess (303) is U-shaped in cross section, with a first wall (308), a second wall (309) and a base (310), who through a

Light exit surface (311) of the display device (305) is formed.